Cast-iron sectional boiler



3 sheets-sheet 1,

(No Model.)

H. A, SMITH. GAST IRON SBGTIONAL Bomen.

No. 482,657. Patented Sept. 13, 1892.

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Patented Sept. 13, 1892.

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Patented Sept. 13, `1892-.

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Harten STATES PATENT Grrrcn.

HENRY A. SMITH, OF DETROIT, MICHIGAN.

CAST-HRON SECTIONAL BOILER.

SPECIFICATION forming part of Letters Patent No. 482,657, dated September 13, 1892i.

Application filed November 3, 1891. Serial No. 410,800. (No model.)

- To a/ZZ whom it may concern:

Be it known that I, HENRY A. SMITH, of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Improvement in Cast-Iron Sectional Boilers, of which the following is a specification.

My invention consists in an improvementv in cast-iron sectional boilers hereinafter fully described and claimed.

Figure lis a perspective of the complete boiler with the front partly broken away. Fig. 2 is a front elevation, partly in section, of one-halt` of the boiler, omitting the front section. Fig. 3 is a rear view of the rear section of the boiler; and Fig. 4 is a section on the lines c x, Figs. I and 3.

The boiler is composed of cast-sections I-I, which are all substantially alike and are placed in two rows opposite each other, as shown in Fig. l; of afront elevation A, in which are formed the re-box, ash-pit, and cleaning-doors; of a rear section Z 5 ot' a base B, which is connected with the various sections H by nipples D, and of a box S, which is common to and is connected with all the various sections by the nipples R. Each section H is of the form shown in Fig. 2, having a riser, two horizontal extensions K and P, and a central horizontal box L, which is connected by the vertical flues M N and M N with the horizontal portions K and I), as shown in Figs. l and 2. The horizon tal portion L does not extend back to the riser, but leaves a space for the passage of products ot" combustion between said portion L and the riser, as clearly indicated by the arrow in Fig. 2. The vertical pipes M N are staggered, as shown in Fig. 4t, and extend to one of the outer edges of the section, as shown in Fig. 4, so that when a number of said sections are placed together said pipes will alternately come in contact, or nearly so, thus forcing products of combustion circulating between said pipes to traveliuazigzag direction. The base B is a cast waterrchamber provided with holes C in its upper side, and by means of nipples D a number of sections H are connected to the base to form one side ofthe boiler. The space between the base B and sections H is covered by a coveringplate F, secured in place by one or more bolts G, and

the sections may be supported on the base by the supporting-plates E, if desired. lWhen the `desired number of sections H have been secured to base B, one half of the boiler is formed, and the other half of the boiler is formed by securing a number of sections H to another base B and then placing the two halves thus formed so that the horizontal portions K K come opposite each other-,butleave a space between, in which space I place one or more dampers, (marked f and g, Figs. l and 2.)

S represents a hollow cast-box forming the top of the boiler, which is connected by means of nipple R with the horizontal portions P with each of the sections H, as clearly shown in Figs. l and 2. This boxSis provided with a central draftdiole U, having a collar for the smoke-stack and provided with a number of openings Y to connect steam or hot-water pipes to said box.

To close the back of the boiler, I make the rear section Z, as shown in Fig. 3,in which the part below the grate is usually separate and is a simple plate, while from the grate up to the top of the tire-box (being that part marked I) the section is formed with a water-chamber connected with the base at one or both sides, and from this water-chamber I rises a central water-chamber J, wide enough to cover the draft caused between the two sets of sections I-I, which water-chamber J is at its upper end connected by a nipple T, Fig. l, with box S. end of the boiler, is formed to fit across the bases B with which it is connected, and would be a continuous hollow box but for feeddoor W and either one or two cleaning-doors W', as may be desired, and at its upper end is connected with the box S in the same manner as the rear section Z is connected therewith. Its lower end extends down,usually as a separate plate not tllled with water, over the ends of the base and carries the ash-pit door W2.

d represents a plate, which closes the aperture between the box Sandtop of sections H.

e represents return ot condensed steam or cooled Water from the risersinto thev base. d represents the grate and may be of any desired form.

Vhen the bases B, sectionsA, II, and Z,

The front section A, to close the other ICO and box S are put together and the plates F and d are put in place, a boiler is formed in which the 'lre is entirely surrounded, except for the door W and the ash-pit, by waterchambers. By opening the dampersfand g the products of combustion are permitted to rise directly through the space between the opposing sections H H to the under side of the box S, and thence through the draft-hole U to the stack. By closing the damperf the products of combustion are forced to pass between the parts K and L of sections H and then back between the parts L and P of saidl sections, as indicated by the arrows in Fig. 2, in traveling which course they are obliged, owing to the contact of the alternate pipes M N and M N', as shown in Fig. 4, to pass around said pipes, thus bringing them in con tact with a very large amount of water-surface. By closing the damper g the draft can be checked for very slow combustion. This arrangement brings the products of combustion into contact with the parts K, L, and P and the pipes M N and M N very nearly at right angles, thus presenting the heating-surface to the products of combustion in the best possible manner. The circulation is, it will be seen, almost vertical from the base B to the box S, a free Way being afforded to the Water by the section H and through the pipes M N. The end sections may be entirely omitted and their places supplied by plates of iron, or the masonry in which boilers of this class are often set, in whichcase the fire, ash-pit, and cleaning-doors would be carried on the front plate or wall. The base B may also be omitted and the sections H connected together at or near their lower ends in the well-known manner of connecting sectional cast-iron boilers and of loop-radiators.

What I claim as my invention, and desire to secure by Letters Patent, is-

V1. A sectional boiler consisting of sections H, having the parts K and P connected together by the pipes M N, the box L, and the pipes M N', substantially as shown and described.

2. A sectional boiler consisting of opposing rows of sections H, each section having an intermediate water-box L, a damper between the opposing boxes L, end sections covering the Vertical space between the two rows of sections H, a manifold at the base of each row of sections, and a drum connected with the top of all the sections, substantially as shown and described.

HENRY A. SMITH.

Witnesses:

CHARLES B. Lo'rHRoP, GERTRUDE H. ANDERSON. 

